Thanks for your report.
Please revert xorg, firefox, thunderbird, banshee (and maybe others)
from PPA to the version from the official Ubuntu repository. You can use
ppa-purge to help you with this.
I'm closing this report because it is not a bug with Ubuntu. Don't
hesitate to submit any new bug.
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/777238
Title:
Update Manager (Could not Calculate the Upgrade) from 10.10 to 11.04
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